I have to say the SR-X MkIII Pro is really a great sounding headphone (with SRM-717 and Lavry). Very balanced from top to bottom (bass is deep and tight), phenomenal timbre, great resoution and dynamics.
Just a hint of sharpness in the midrange. Soundstage is not big but not cramped either.
The headband might need a bit of extra padding but otherwise the comfort is better than what I remembered, having the NB version earlier (but with a different source)
Tonally I prefer this to the SR-007 which imho has too much bass and treble and too coloured mids. Still no SR-009 though...